Shock wave equation of state of serpentine to 150 GPa

implications for the occurrence of water in the Earth's lower mantle

James Tyburczy, T. S. Duffy, T. J. Ahrens, M. A. Lange

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

The shock equation of state of serpentine has been determined to 150 GPa. Four distinct regions occur along the Hugoniot: a low-pressure phase, a mixed phase region, a high-pressure phase, and a very high pressure phase. Thermodynamic calculations indicate that under equilibrium conditions, serpentine would decompose to oxides plus water at conditions below 10 GPa along the Hugoniot. The high-pressure density and sound speed of an H2O-rich magnesium silicate determined from shock equation of state experiments indicate that the observed seismic properties of the lower mantle allow the existence of several weight percent of water in the lower mantle. -from Authors

Original languageEnglish (US)
JournalJournal of Geophysical Research
Volume96
Issue numberB11
StatePublished - 1991

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lower mantle
wave equation
Wave equations
shock wave
Equations of state
equation of state
Shock waves
wave equations
shock waves
Earth mantle
equations of state
Earth (planet)
occurrences
Water
shock
water
seismic property
magnesium
low pressure
silicates

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

Cite this

Shock wave equation of state of serpentine to 150 GPa : implications for the occurrence of water in the Earth's lower mantle. / Tyburczy, James; Duffy, T. S.; Ahrens, T. J.; Lange, M. A.

In: Journal of Geophysical Research, Vol. 96, No. B11, 1991.

Research output: Contribution to journalArticle

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AU - Lange, M. A.

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AB - The shock equation of state of serpentine has been determined to 150 GPa. Four distinct regions occur along the Hugoniot: a low-pressure phase, a mixed phase region, a high-pressure phase, and a very high pressure phase. Thermodynamic calculations indicate that under equilibrium conditions, serpentine would decompose to oxides plus water at conditions below 10 GPa along the Hugoniot. The high-pressure density and sound speed of an H2O-rich magnesium silicate determined from shock equation of state experiments indicate that the observed seismic properties of the lower mantle allow the existence of several weight percent of water in the lower mantle. -from Authors

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